Basic Documentation
Table Of Contents
- 1 About this document
- 2 Overview
- 3 Notes
- 4 Functions
- 4.1 Temperature control
- 4.2 Operating modes
- 4.3 Room temperature setpoints
- 4.4 Application overview
- 4.5 Power supply selection for RDG200KN
- 4.6 Additional functions
- 4.7 Control sequences
- 4.7.1 Sequence overview (setting via P001)
- 4.7.2 Application mode
- 4.7.3 2-pipe fan coil unit
- 4.7.4 2-pipe fan coil unit with electric heater
- 4.7.5 2-pipe fan coil unit with radiator or floor heating
- 4.7.6 2-stage heating and cooling
- 4.7.7 4-pipe fan coil unit
- 4.7.8 4-pipe fan coil unit with electric heater
- 4.7.9 Chilled/heated ceiling and radiator applications
- 4.7.10 Compressor applications
- 4.7.11 Applications with external AQR sensor or QMX room operator unit
- 4.7.12 Setpoints and sequences
- 4.8 Control outputs
- 4.9 Fan control
- 4.10 Multifunctional input, digital input
- 4.11 Handling system faults
- 4.12 KNX communications
- 4.12.1 S-Mode
- 4.12.2 Master/slave configuration in KNX S-Mode
- 4.12.3 LTE-Mode
- 4.12.4 Zone addressing in LTE-Mode (with Synco)
- 4.12.5 Master/slave configuration in LTE-Mode
- 4.12.6 Example of heating and cooling demand zones
- 4.12.7 Send heartbeat and receive timeout
- 4.12.8 Startup
- 4.12.9 Heating and cooling demand
- 4.12.10 Fault and alarms function on KNX
- 4.13 Communication objects
- 4.14 Communication objects (LTE-Mode)
- 4.15 Control parameters
- 5 Supported KNX tools
- 6 Connection
- 7 Technical data
- 8 Dimensions
- Index
Functions
Control sequences
4
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4.7.7.1 4-pipe application with PICV and 6-port control ball
valve as changeover (RDG260KN)
In a 4-pipe fan coil application with DC 0...10 V fan control, the RDG260KN
controls a combi valve (PICV) in combination with a 6-port ball valve as
changeover.
Note: Set DIP# 1 & 4 to ON (4-pipe with 6-port ball valve as changeover and PICV).
This application is used in 4-pipe systems with heat exchanger and differential
pressure controller (using a PICV).
The changeover signal DC 0…10 V controls the flow rate in the PICV, while the 6-
port ball valve, connected to the relay outputs, is used as changeover to switch the
sequence between heating and cooling.
Enable the flow limitation function (for PICV) via parameter P256 to balance
heating and cooling and avoid hydraulic problems caused by the different flow
rates. (see Additional functions [➙ 45]).
The fan can only be set on DC Y50 output in this application.
Set fan operation (P350) to enable (enable by default).
T[℃]
Room temperature
Y10
DC 0…10 V signal
W
Room temperature setpoint
YH
Control command "Valve"
(heating)
YC
Control command "Valve"
(cooling)
P256
Flow limitation function for
heating only
See Chilled/heated ceiling with pressure independent combi valve (PICV) and 6-
port ball valve for changeover (RDG260KN) [➙ 87] for detailed information on how
the thermostat limits the mix of the heating and cooling medium as well as control
outputs.
The connection diagram for 4-pipe applications with PICV and 6-port ball valve as
changeover is available in Connection diagrams [➙ 148].
Principle